(CNN) - A new wrinkle emerged Thursday in the autobiography of a rising Republican star: Sen. Marco Rubio, R-Florida, was once a Mormon. Rubio, a Cuban-American who has played up his Catholic roots on the campaign trail and today attends Catholic churches as well as a Southern Baptist megachurch, was a member of the Church of Jesus Christ of Latter-day Saints as a young boy.

Rubio's attendance in the church was little-known and made a splash when details of a forthcoming memoir were reported Thursday by the Miami Herald and the website BuzzFeed.